World 4 (Super Mario Galaxy 2)
World 4: The Many Mysteries of the Cosmos is the fourth world in Super Mario Galaxy 2. It is located near a spiral galaxy. It holds seven galaxies, the last of which, Bowser's Gravity Gauntlet, features the second encounter with Giant Bowser, who again attacks Mario on a small planet, though now with several new moves. The Hungry Luma galaxy is available right when the player enters, which does not happen in any other world.
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